BBK BBK918S, Service Manual

Page: 42 / 64

SW1
1
SW2
2
SW3
3
SW4
4
DO
5
DIN
6
VSS
7
CLK
8
STB
9
KEY1
10
KEY2
11
KEY3
12
KEY4
13
VDD
14
S1
15
S2
16
S3
17
S4
18
S5
19
S6
20
S7
21
S8
22
S9
23
S10
24
S11
25
S12/G1
26
VEE
27
S13/G1
28
S14/G9
29
S15/G8
30
S16/G7
31
G6
32
G5
33
G4
34
G3
35
G2
36
G1
37
VDD
38
LED4
39
LED3
40
LED2
41
LED1
42
VSS
43
OSC
44
U401
UPD16312
C401 104
C403 101
C404 101
1 2 3
U403 HS0038A2
K404 K403 K401 K402
D401 1N4148
D402
1N4148
-25V GRID5
GRID4
GRID3
GRID2
GRID1
VCC
SEG11 SEG10 SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
VCC
VFDST
VFDCK VFDAT
VCC
KEY1 KEY2 KEY3 KEY4
GND
SW4
SW3
SW2
MSW
GND
SEG12 SEG13 SEG14 SEG15 SEG16
VCC
KEY4 KEY3 KEY2 KEY1
-25V
FIL+
FIL-
SEG1
SEG2
VFDST VFDCK VFDAT IR GND GND C405 104
R415 100
IR
VCC
R405 51K
R401
33K
R402
33K
R403
33K
R404
33K
R406
10K
R407
10K
R408
10K
R409
10K
R410
10K
R411 33K
R412 33K
R413 33K
R414 33K
GRID1 GRID2 GRID3 GRID4 GRID5 FIL- FIL+
K405
SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16
R416 10K
VCC
C406 101
R417 10K
VCC
2 3 4 1 5
XS402 XS05
2 3 4 1 5
XS401 XS05
C402 100uF/16V
C407
100uF/16V
F2
32
F2
31
P16
29
P13
26
P14
27
P15
28
P12
25
P11
24
P10
23
P9
22
P8
21
P7
20
P6
19
P5
18
P4
17
P3
16
P2
15
P1
14
NC
13
NC
12
NC
11
NC
10
5G
4
NC
9
1G
8
2G
7
3G
6
4G
5
F1
2
F1
1
VFD401 VFD-32
R418 33R